Fixed so the CG plugin will not register a factory when the GLES2 render system is the active render system.
Fixed so the CG plugin will not register a factory when the GLES2 render system is the active render system.

digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre